GasWatch 3 for CO and O
2
Chapter 6: Maintenance • 75
3. Use a small Phillips screwdriver to unscrew the battery retainer’s screw.
4. Remove the battery retainer.
5. Remove the old battery.
6. Install the new CR2450 button cell battery and reinstall the battery retainer and screw.
7. If the instrument has been without batteries for more than 5 minutes, the date and time are
reset and need to be set again. When the new batteries are installed, the instrument
automatically turns on and displays the Date/Time Screen. Set the date and time as
described on pg.70. Once the date and time are set, the instrument begins its warmup
sequence. If you do not set the date and time within 30 seconds, the instrument
automatically begins its warmup sequence.
Replacing the Charcoal Filter
1. Verify that the GasWatch 3 is off.
2. Use a small Phillips screwdriver to unscrew the sensor retainer’s screw.
3. Remove the sensor retainer.
4. The white hydrophobic filter and the sensor gasket should stay on the sensor.
5. Remove the white hydrophobic filter.
6. Remove the black charcoal filter from the center of the sensor gasket.
Figure 9: Removing the Battery Retainer
Screw
Battery Retainer
CR2450 Battery
+ Side
Figure 10: Installing a New Battery
